
17. 17. Bar diameter for external threads (for cutting type dies)
■Sewing machine screw threads (for 2nd class)
■ Unit : mm
| Size | major diameter o | f external threads | bar diameter (ref) |
| dmax | dmin | . |
| SM 80 1/16 | 1.588 | 1.518 | 1.54 |
| SM 64 5/64 | 1.984 | 1.904 | 1.92 |
| SM 56 3/32 | 2.381 | 2.286 | 2.31 |
| SM 100 3/32 | 2.381 | 2.306 | 2.32 |
| SM 40 1/8 | 3.175 | 3.045 | 3.08 |
| SM 44 1/8 | 3.175 | 3.055 | 3.09 |
| SM 40 9/64 | 3.572 | 3.442 | 3.47 |
| SM 40 11/64 | 4.366 | 4.236 | 4.27 |
| SM 24 3/16 | 4.762 | 4.602 | 4.64 |
| SM 28 3/16 | 4.762 | 4.602 | 4.64 |
| SM 32 3/16 | 4.762 | 4.602 | 4.64 |
| SM 32 7/32 | 5.556 | 5.396 | 5.44 |
| SM 28 15/64 | 5.953 | 5.773 | 5.82 |
| SM 24 1/4 | 6.350 | 6.170 | 6.22 |
| SM 40 1/4 | 6.350 | 6.220 | 6.25 |
| P | dmax | dmin | T | dmax | dmin | T | No.0-80UNF | 1.511 | 1.431 | 1.45 |
| 4.5 | 41.937 | 41.437 | 0.500 | 41.930 | 41.610 | 0.320 | No.1-64UNC | 1.838 | 1.743 | 1.77 |
1.5 41.968 41.732 0.236 41.950 41.780 0.170 No.3-48UNC 2.496 2.383 2.41
| 2 | 44.962 | 44.682 | 0.280 | 44.940 | 44.640 | 0.300 | No.5-40UNC | 3.154 | 3.026 | 3.06 |
| 4 | 47.940 | 47.465 | 0.475 | 47.940 | 47.465 | 0.475 | No.6-40UNF | 3.484 | 3.356 | 3.39 |
| M48 3 | 47.952 | 47.577 | 0.375 | 47.952 | 47.577 | 0.375 | No.8-32UNC | 4.142 | 3.991 | 4.03 |
| | | | | | | No.10-32UNF | 4.803 | 4.651 | 4.69 |
| | | | | | | No.12-24UNC | 5.461 | 5.279 | 5.32 |
| | | | | | | 1/4-28UNF | 6.324 | 6.160 | 6.20 |
| | | | | | | | | | ・from table 2 JIS B 0226 (void in 2001) |
| | | | | | | 5/16-18UNC | 7.907 | 7.687 | 7.74 |
| | | | | | | 5/16-24UNF | 7.909 | 7.727 | 7.77 |
| | | | | | | 3/8-16UNC | 9.491 | 9.254 | 9.31 |
| | | | | | | 3/8-24UNF | 9.497 | 9.315 | ■ ■ 9.36 |
| | | | | | | 7/16-14UNC | 11.076 | 10.816 | Parallel pipe threads (PF · G)(for A class) Taper pipe threads (PT, R) 10.88 |
| | | | | | | | | | Unit : mm Unit : mm |
| | | | | | | 7/16-20UNF | 11.079 | 10.874 | 10.93 |
| Size | bar diamet | er (ref.) |
| | taper (dia of thread end) | Straight |
| PT | 1/16 - 28 | 7.5 | 7.9 |
| PT | 1/8 - 28 | 9.5 | 9.9 |
| PT | 1/4 - 19 | 12.8 | 13.4 |
| PT | 3/8 - 19 | 16.3 | 16.9 |
| PT | 1/2 - 14 | 20.5 | 21.3 |
| PT | 3/4 - 14 | 25.9 | 26.8 |
| PT | 1 - 11 | 32.7 | 33.7 |
| PT | 11/4 - 11 | 41.2 | 42.3 |
| PT | 11/2 - 11 | 47.1 | 48.2 |
| PT | 2 - 11 | 58.7 | 60.1 |
| Size | major diameter o | f external threads | bar diameter (ref) |
| | dmax | dmin | . |
| PF | 1/16 - 28 | 7.723 | 7.509 | 7.56 |
| PF | 1/8 - 28 | 9.728 | 9.514 | 9.57 |
| PF | 1/4 - 19 | 13.157 | 12.907 | 13.0 |
| PF | 3/8 - 19 | 16.662 | 16.412 | 16.5 |
| PF | 1/2 - 14 | 20.955 | 20.671 | 20.7 |
| PF | 5/8 - 14 | 22.911 | 22.627 | 22.7 |
| PF | 3/4 - 14 | 26.441 | 26.157 | 26.2 |
| PF | 7/8 - 14 | 30.201 | 29.917 | 30.0 |
| PF | 1 - 11 | 33.249 | 32.889 | 33.0 |
| PF | 11/8 - 11 | 37.897 | 37.537 | 37.6 |
| PF | 11/4 - 11 | 41.910 | 41.550 | 41.6 |
| PF | 11/2 - 11 | 47.803 | 47.443 | 47.5 |
| PF | 2 - 11 | 59.614 | 59.254 | 59.3 |
| 9/16-12UNC | 14.246 | 13.958 | 14.0 |
| 5/8-18UNF | 15.839 | 15.619 | 15.7 |
| 7/8-14UNF | 22.184 | 21.923 | 22.0 |
| 1-8UNC | | | |
| 1 1/8-12UNF | 28.529 | 28.240 | 28.3 |
| 1 3/8-12UNF | 34.876 | 34.588 | 34.7 |
| 1 1/2-12UNF | 38.051 | 37.763 | 37.8 |
| 1 3/4-5UNC | 44.381 | 43.861 | 44.0 |
| 2-4.5UNC | 50.726 | 50.168 | 50.3 |